Which university are you at? diffundox dosage In return for saving this money, MPs accrue 1/40th of salary per year of service. This means that if they were to retire tomorrow, they would receive an annual pension, linked to CPI (consumer prices index), of £1,643, based on that year’s contribution alone. To put this into some kind of perspective, it would cost a healthy man retiring at 65 about £45,000 to buy an annuity that would provide a similar pension.